Every few years, the coal workers ___________ their lungs X-rayed to ensure their health.
| A．are having | B．have | C．have had | D．had had |
For many years, people __ electric ears. However, making them has been more difficult than predicted.
| A．had dreamed of | B．have dreamed of | C．dreamed of | D．dream of |
. Had I known about this computer program, a huge amount of time and energy __ .
| A．would have been saved | B．had been saved |
| C．will be saved | D．was saved |
If you plant watermelon seeds in the spring, you __ fresh watermelon in the fall.
| A．eat | B．would eat | C．have eaten | D．will be eating |
By the time the tornado ended, more than 700 people _________.
| A．have killed | B．had been killed | C．were killed | D．had killed |
.---- It is high time I _______ to school.I have to go now
---- See you!
---- See you!
| A．had gone | B．went | C．would go | D．should have gone |
．----Did you get a ticket ?
----Yes, otherwise, I_____ the concert last night.
| A．didn’t attend | B．wouldn’t attend |
| C．hadn’t attended | D．couldn’t have attend |
—What were you doing when she dropped in?
—I for a while and_________ some reading.
| A．was playing; was going to do | B．played; did |
| C．had played; was going to do | D．had played; did |
He___________ when the bus came to a sudden stop.
| A．was almost hurt | B．was to hurt himself |
| C．was hurt himself | D．was hurting himself |
—What would you wish to do if you were a college student again?
—That's very hard to say, but I wish I when I was a college student.
| A．has not studied biology | B．did study biology |
| C．had studied biology | D．studied biology |